A beloved character all-around, Remus Lupin remains the best DADA professor of Harry's time. His genuine devotion to teaching and his first-hand knowledge of magical defense made his classes a real joy for his students—sans the picky Slytherins—who enjoyed his practical classes on dark creatures and dark magic.
I think Minerva McGonagall and Remus Lupin are the best teachers. Professor McGonagall is the strict sort that doesn't put up with any nonsense, but she is fair and cares about her students.
Harry's favourite professor, Dumbledore is the reason that Harry is alive. Right from the beginning, when Dumbledore ordered Hagrid to take infant Harry to the Dursleys where he would be the safest, to the end, when he told Harry everything about Voldemort so that Harry could finish him, he was a stellar character.
Professor Severus Snape was Harry's least favorite teacher. Harry also happened to be Snape's least favorite student.
The evilest professor in all of Hogwarts is, without a doubt, Dolores Umbridge. Having nothing to do with Voldemort makes her level of cruelty somehow worse, as she was acting completely off her own steam.
Out of all Hogwarts Legacy professors, Aesop Sharp likely has one of the most grim backstories, but he may be a much darker character than he initially lets on.
The Head of Slytherin is Horace Slughorn (who left the role to Severus Snape for fifteen years before taking it up again in 1996) and the House's patron ghost is the Bloody Baron.
Arguably the most famous female character in Harry Potter, Hermione was a dedicated student who always strived to be the best no matter what it took.
Teaching career at Hogwarts
Slughorn during the time he taught Tom Riddle. After completing his education, Slughorn was made Potions Master, by Hogwarts School of Witchcraft and Wizardry, at the same time as Albus Dumbledore started.
Voldemort was the overarching villain of the whole Harry Potter series. His despicable plan to rid the Wizarding World of "Mudbloods" began a decades-long fight. Voldemort cared for nothing and no one but himself. His greatest wish was for people to fear him above all else.
Snape loved Lily deeply: through their years at Hogwarts; through her marriage to another wizard, James Potter; through his time as a Death Eater; and long after her murder at the wand of Lord Voldemort.
Hermione Granger is the "cleverest witch of [her] age" and the strongest Hogwarts student in the series.
Who is Umbridge? Umbridge refers to the fictional character Dolores Umbridge, a malevolent, uptight, and pink-garbed villain in the Harry Potter series.
Nobody can deny that Hermione Granger is the smartest character in Harry Potter, gender notwithstanding. She is consistently the best student in every year, earning extraordinary marks in all her exams and ten OWLS.
Tom Riddle/Voldemort
Professor Dumbledore once said that Tom Riddle, a.k.a. Lord Voldemort, a.k.a. "He Who Must Not Be Named" (Ralph Fiennes/Hero Fiennes Tiffin/Christian Coulson), was the most brilliant student that Hogwarts has ever known.
Phineas Nigellus Black, who to this day remains the least popular headmaster Hogwarts has ever known, makes little effort to hide the utter disdain he has for his students. He is a cantankerous, lazy and vain pure-blood with a myopic view of the world and a condescending and unjustifiably superior attitude.
Critics have recognised Umbridge as one of the most hated, as well as the most compelling, villains in the series. Umbridge was portrayed by Imelda Staunton in Harry Potter and the Order of the Phoenix and Harry Potter and the Deathly Hallows – Part 1.
In the second book, Rowling establishes that Voldemort hates non-pure-blood wizards, despite being a half-blood himself.
Bellatrix Lestrange (née Black) is the first female Death Eater introduced in the books. Aunt of Draco Malfoy and Nymphadora Tonks. She was introduced in Harry Potter and the Order of the Phoenix. She is the most faithful member of Voldemort's inner circle.
Lord Voldemort is the scariest villain in Harry Potter, if only because he is the series' overreaching villain who successfully evades death more than once.
There is no doubt in the world that Draco Malfoy is the most hot, cute, beautiful, and adorable character in the whole Harry Potter world.
Despite Harry's objections, the Hydra Throne bestowed Harry with the title of Prince of Slytherin.
Horace Slughorn (1997 - present) Horace, after being convinced by Dumbledore and Harry Potter, returned to Hogwarts as the Potions master. After Severus killed Dumbledore and became headmaster of Hogwarts, it was decided that Horace was to become the Head of Slytherin House once again.